What are the amplitude, period, phase shift, and midline of f(x) = −4 cos(3x − π) + 1? amplitude: −4; period: pi over 3; phase shift: x = pi over 4; midline: y = −1 amplitude: 4; period: pi over 3; phase shift: x = pi over 4; midline: y = 1 amplitude: −4; period: 2 pi over 3; phase shift: x = pi over 3; midline: y = −1 amplitude: 4; period: 2 pi over 3; phase shift: x = pi over 3; midline: y = 1?

Alright, lets get started.

The standard form for cos function is

Where

A = Amplitude (positive value)

Period =

Phase shift =

Mid line or vertical shift = D

So, comparing the given function with standard

A = 4

B = 3

C=

D = 1

Means Amplitude = 4

Period =

Phase shift =

Mid line = 1

Hence the answer is last choice 4.

Hope it will help :)

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

$9.41

step-by-step explanation: